/* Mednafen - Multi-system Emulator
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "mednafen.h"
#include "endian.h"

void Endian_A16_Swap(void *src, uint32 nelements)
{
  uint32 i;
  uint8 *nsrc = (uint8 *)src;

  for(i = 0; i < nelements; i++)
  {
    uint8 tmp = nsrc[i * 2];

    nsrc[i * 2] = nsrc[i * 2 + 1];
    nsrc[i * 2 + 1] = tmp;
  }
}

void Endian_A32_Swap(void *src, uint32 nelements)
{
  uint32 i;
  uint8 *nsrc = (uint8 *)src;

  for(i = 0; i < nelements; i++)
  {
    uint8 tmp1 = nsrc[i * 4];
    uint8 tmp2 = nsrc[i * 4 + 1];

    nsrc[i * 4] = nsrc[i * 4 + 3];
    nsrc[i * 4 + 1] = nsrc[i * 4 + 2];

    nsrc[i * 4 + 2] = tmp2;
    nsrc[i * 4 + 3] = tmp1;
  }
}

void Endian_A64_Swap(void *src, uint32 nelements)
{
  uint32 i;
  uint8 *nsrc = (uint8 *)src;

  for(i = 0; i < nelements; i++)
  {
    uint8 *base = &nsrc[i * 8];

    for(int z = 0; z < 4; z++)
    {
      uint8 tmp = base[z];

      base[z] = base[7 - z];
      base[7 - z] = tmp;
    }
  }
}

void Endian_A16_NE_to_LE(void *src, uint32 nelements)
{
#ifdef MSB_FIRST
  Endian_A16_Swap(src, nelements);
#endif
}

void Endian_A32_NE_to_LE(void *src, uint32 nelements)
{
#ifdef MSB_FIRST
  Endian_A32_Swap(src, nelements);
#endif
}

void Endian_A64_NE_to_LE(void *src, uint32 nelements)
{
#ifdef MSB_FIRST
  Endian_A64_Swap(src, nelements);
#endif
}


void Endian_A16_LE_to_NE(void *src, uint32 nelements)
{
#ifdef MSB_FIRST
  uint32 i;
  uint8 *nsrc = (uint8 *)src;

  for(i = 0; i < nelements; i++)
  {
    uint8 tmp = nsrc[i * 2];

    nsrc[i * 2] = nsrc[i * 2 + 1];
    nsrc[i * 2 + 1] = tmp;
  }
#endif
}

void Endian_A16_BE_to_NE(void *src, uint32 nelements)
{
#ifdef LSB_FIRST
  uint32 i;
  uint8 *nsrc = (uint8 *)src;

  for(i = 0; i < nelements; i++)
  {
    uint8 tmp = nsrc[i * 2];

    nsrc[i * 2] = nsrc[i * 2 + 1];
    nsrc[i * 2 + 1] = tmp;
  }
#endif
}


void Endian_A32_LE_to_NE(void *src, uint32 nelements)
{
#ifdef MSB_FIRST
  uint32 i;
  uint8 *nsrc = (uint8 *)src;

  for(i = 0; i < nelements; i++)
  {
    uint8 tmp1 = nsrc[i * 4];
    uint8 tmp2 = nsrc[i * 4 + 1];

    nsrc[i * 4] = nsrc[i * 4 + 3];
    nsrc[i * 4 + 1] = nsrc[i * 4 + 2];

    nsrc[i * 4 + 2] = tmp2;
    nsrc[i * 4 + 3] = tmp1;
  }
#endif
}

void Endian_A64_LE_to_NE(void *src, uint32 nelements)
{
#ifdef MSB_FIRST
  uint32 i;
  uint8 *nsrc = (uint8 *)src;

  for(i = 0; i < nelements; i++)
  {
    uint8 *base = &nsrc[i * 8];

    for(int z = 0; z < 4; z++)
    {
      uint8 tmp = base[z];

      base[z] = base[7 - z];
      base[7 - z] = tmp;
    }
  }
#endif
}

void FlipByteOrder(uint8 *src, uint32 count)
{
  uint8 *start=src;
  uint8 *end=src+count-1;

  if((count&1) || !count)        return;         /* This shouldn't happen. */

  count >>= 1;

  while(count--)
  {
    uint8 tmp;

    tmp=*end;
    *end=*start;
    *start=tmp;
    end--;
    start++;
  }
}

void Endian_V_LE_to_NE(void *src, uint32 bytesize)
{
#ifdef MSB_FIRST
  FlipByteOrder((uint8 *)src, bytesize);
#endif
}

void Endian_V_NE_to_LE(void *src, uint32 bytesize)
{
#ifdef MSB_FIRST
  FlipByteOrder((uint8 *)src, bytesize);
#endif
}

int write16le(uint16 b, FILE *fp)
{
  uint8 s[2];
  s[0]=b;
  s[1]=b>>8;
  return((fwrite(s,1,2,fp)<2)?0:2);
}

int write32le(uint32 b, FILE *fp)
{
  uint8 s[4];
  s[0]=b;
  s[1]=b>>8;
  s[2]=b>>16;
  s[3]=b>>24;
  return((fwrite(s,1,4,fp)<4)?0:4);
}

int read32le(uint32 *Bufo, FILE *fp)
{
  uint32 buf;
  if(fread(&buf,1,4,fp)<4)
    return 0;
#ifdef LSB_FIRST
  *(uint32*)Bufo=buf;
#else
  *(uint32*)Bufo=((buf&0xFF)<<24)|((buf&0xFF00)<<8)|((buf&0xFF0000)>>8)|((buf&0xFF000000)>>24);
#endif
  return 1;
}

int read16le(char *d, FILE *fp)
{
#ifdef LSB_FIRST
  return((fread(d,1,2,fp)<2)?0:2);
#else
  int ret;
  ret=fread(d+1,1,1,fp);
  ret+=fread(d,1,1,fp);
  return ret<2?0:2;
#endif
}

